Thanks for all your help. There's nothing like hearing from the experts. SO, if I were to upgrade to the mega-woofers and PR, would I hear much difference using the same amp or would I need a lot more power to appreciate the improvement. Thanks again, Bob
Difference should be substantial.
You have lighter cones, stiffer cones, larger magnets, and greater power handling.
On the PR you will also get factory vitrification

Your power is good (as long as that amp is still in good shape)
Your improvement will be on ALL fronts. It will play deeper, it will be more dynamic, it will have greater output, and it will be "faster" and have more detail (once fine tuned and broken in)
If you like what you have now, get ready for MORE of the same at a higher level.